Escalating once a threshold is reached

We know how to perform an action if a threshold is reached, such as the temperature being too high, the available disk space being too low, or a web server not working. We can send a message, open a ticket in a tracker, run a custom script, or execute a command on a remote machine. But all of these are simple if-then sequences; if it's this problem, then do this. Quite often, the severity of the problem depends on how long the problem persists. For example, a connection loss to a branch office that lasts a couple of minutes might not be critical, but it's still worth noting down and emailing IT staff. The inability to reach a branch office for five minutes is quite important, and, at this point, we would ...

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